921191912c
In light of commit ea0d494dae0d3d6f, it seems like a good idea to add a regression test that will complain about random functions taking or returning cstring. Only I/O support functions and encoding conversion functions should be declared that way. While at it, add some checks that encoding conversion functions are declared properly. Since pg_conversion isn't populated manually, it's not quite as necessary to check its contents as it is for catalogs like pg_proc; but one thing we definitely have not tested in the past is whether the identified conproc for a conversion actually does that conversion vs. some other one.
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